netdev - Re: [PATCH RFC 36/77] ipr: Enable MSI-X when IPR_USE_MSIX type is set, not IPR_USE

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Date:	Wed, 02 Oct 2013 14:31:25 -0500
From:	Brian King <brking@...ux.vnet.ibm.com>
To:	Alexander Gordeev <agordeev@...hat.com>
CC:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	"VMware, Inc." <pv-drivers@...are.com>,
	linux-nvme@...ts.infradead.org, linux-ide@...r.kernel.org,
	stable@...r.kernel.org, linux-s390@...r.kernel.org,
	Andy King <acking@...are.com>, linux-scsi@...r.kernel.org,
	linux-rdma@...r.kernel.org, x86@...nel.org,
	linux-pci@...r.kernel.org, iss_storagedev@...com,
	linux-driver@...gic.com, Tejun Heo <tj@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jon Mason <jon.mason@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	netdev@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
	e1000-devel@...ts.sourceforge.net,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linuxppc-dev@...ts.ozlabs.org,
	Wendy Xiong <wenxiong@...ux.vnet.ibm.com>
Subject: Re: [PATCH RFC 36/77] ipr: Enable MSI-X when IPR_USE_MSIX type is
 set, not IPR_USE_MSI

On 10/02/2013 05:48 AM, Alexander Gordeev wrote:
> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> ---
>  drivers/scsi/ipr.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
> index fb57e21..762a93e 100644
> --- a/drivers/scsi/ipr.c
> +++ b/drivers/scsi/ipr.c
> @@ -9527,7 +9527,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
>  		ipr_number_of_msix = IPR_MAX_MSIX_VECTORS;
>  	}
> 
> -	if (ioa_cfg->ipr_chip->intr_type == IPR_USE_MSI &&
> +	if (ioa_cfg->ipr_chip->intr_type == IPR_USE_MSIX &&
>  			ipr_enable_msix(ioa_cfg) == 0)
>  		ioa_cfg->intr_flag = IPR_USE_MSIX;
>  	else if (ioa_cfg->ipr_chip->intr_type == IPR_USE_MSI &&
> 

Nack. ioa_cfg->ipr_chip->intr_type gets initialized from the ipr_chip table
at the top of the driver which never sets intr_type to IPR_USE_MSIX, so this
will break MSI-X support for ipr. 

We indicate at the chip level only whether we want to force LSI or whether
we want to enable MSI / MSI-X and then try enabling MSI-X and fall back to
MSI if MSI-X is not available or does not work. We then set intr_flag to indicate
what we are actually using on the specific adapter.

Thanks,

Brian

-- 
Brian King
Power Linux I/O
IBM Linux Technology Center


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